GrapheneOS made clear they don't want to support anything bit Pixel devices countless times if I am not wrong and it's creator is anything but cooperative!

I don't think GrapheneOS project likes Fairphone

probably cuz /e/ OS is run by Murena, which is still a company trying to make a profit. graphene OS is all community-driven right?

it's because Pixel Phones are very advanced technology wise and have good chips and hardware in general, that is under scruteny of security research all the time. Such that it is the most secure hardware for an android phone. I don't think Fairphones come anywhere close that when it comes to hardware :( Altho I hate having to buy a new Pixel every time it's end of life. I would much rater support Fairphones.

Different projects that do similar things

I'd note: just installing lineageOS or /e/OS already triggers the boot tampered message. You're already going to lose the ability to check as it's already deviated from normal stock. Having a phone that omits this feature makes no difference.

I have one that runs this OS, pretty well I think. What was wrong with yours?

L for you